@Yishai If you have to drink anyway (more likely than you have to eat) then why not say Kiddush on it?
– Double AA♦Aug 26 '14 at 13:57

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@DoubleAA, Kiddush is only BeMakom Seuda. If you had to drink wine (say in a place where water wasn't potable or something), then maybe (if you had to drink enough of it, or if you had to eat bread as well).
– YishaiAug 26 '14 at 13:59

@Yishai You could drink two reviyot (or really, a male lugmav + a reviit). Why "in a place where water wasn't potable"? If you have to drink, might as well get some calories, no?
– Double AA♦Aug 26 '14 at 14:00

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@DoubleAA, Alcohol is dehydrating, and I assume the goal is to get hydrated with the least amount of liquid as possible. If you are thinking of grape juice, it may not make a Makom Seuda with a reviit (at least that is what my LOR said, but I don't know the source).
– YishaiAug 26 '14 at 14:04

But what if they do have to eat so much that they can eat meat etc.? Is there still an idea of Kavod Yom Tov? What does Lechem Mishneh have to do with volume eaten? Note most (all?) Ashkenazi authorities reject a measurement in grams.
– Double AA♦Aug 26 '14 at 13:57